Epiaeschna heros
In 3 days ~40% in a week ~70%
Epiaeschna heros, the swamp darner, is a species of darner in the dragonfly family Aeshnidae. It is found in eastern North America. It is the only extant member of the genus Epiaeschna, a genus that is well-represented in fossil specimens found in Eurasia, suggesting a wider distribution during the mid-Cenozoic.
The IUCN conservation status of Epiaeschna heros is "LC", least concern, with no immediate threat to the species' survival. The population is stable. The IUCN status was reviewed in 2017. The species has been witnessed feeding on Solenopsis invicta ants during nuptial flights. Wikipedia →
| # | Park | Country | Daily sighting probability |
|---|---|---|---|
| 1 | Congaree National Park | 🇺🇸 United States | |
| 2 | Point Pelee National Park | 🇨🇦 Canada |
| # | City | Country | Daily sighting probability |
|---|---|---|---|
| 1 | New York City | 🇺🇸 United States | |
| 2 | Philadelphia | 🇺🇸 United States | |
| 3 | Houston | 🇺🇸 United States | |
| 4 | Chicago | 🇺🇸 United States | |
| 5 | Washington | 🇺🇸 United States | |
| 6 | Baltimore | 🇺🇸 United States | |
| 7 | Dallas | 🇺🇸 United States | |
| 8 | Boston | 🇺🇸 United States | |
| 9 | Toronto | 🇨🇦 Canada | |
| 10 | Austin | 🇺🇸 United States |
With luck
About 10% of wildlife watchers report a Swamp Darner sighting in Congaree National Park on a given day, based on 15 verified sightings from GBIF citizen-science data from 2019 to 2026. It is the 63rd most-seen of the 145 insects we can rate there. Over three days the chance rises to about 40%, and over a week to about 70%, if each day is a fresh chance.
April
In that month about 30% of wildlife watchers report a Swamp Darner in Congaree National Park on a given day, against under 5% in July and September–March, the lowest months.
Between 11 am and 2 pm
Across all the parks we cover, that three-hour window holds the most Swamp Darner sightings with a recorded time, and nearly all of them come between 6 am and 6 pm: it is a daytime animal.
Yes
Of the 2 parks where we can rate Swamp Darner sightings, Congaree National Park has the highest daily chance: about 10%. Next come Point Pelee National Park (Canada, about 10%).
GBIF citizen-science records
It is estimated from how often the Swamp Darner is recorded against all the insects logged in Congaree National Park (15 verified sightings from 2019 to 2026), calibrated against known sighting rates. Figures are rounded to the nearest 10% because citizen-science data supports honest approximations, not decimals, and months with records from fewer than five people show "—". How it works.
